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` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> r RESNA Industries Client Project ID Arco #2076, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Cherven QC Sample Group 1110672-81 Reported Nov 26, 1991 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead Benzene Toluene Ethyl benzene Xylenes <br /> Method EPA 6010 EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst S Foster C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units mg/kg ppm ppm ppm ppm <br />' Date Analyzed Nov 22 1991 Nov 24, 1991 Nov 24 1991 Nov 24 1991 Nov 24 1991 <br /> QC Sample # 111-0672 111-0695 1110695 1110695 111-0695 <br /> Sample Conc • 11 N D N D N D N D <br /> t . Spike Conc <br /> Added 250 020 020 020 040 <br /> Conc Matrix <br /> Spike 230 017 017 017 036 <br /> i <br /> Matrix Spike <br /> % Recovery 88 85 85 85 90 <br /> Conc Matrix <br />' Spike Dup 230 018 019 018 0 37 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 88 90 95 90 92 <br /> Relative <br /> % Difference 0 0 1 1 34 2 3 2 2 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative% Difference Cone of M S -Cone of MSD x 100 <br /> Rick R DlMaio (Conc of M S + Conc of M S D)/2 <br /> Project Manager 1110672 RES <7> <br />